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TM 55-4920-412-13&P
(7)
Disconnect digital multimeter lead from J3
pin 1 and reconnect to J3 pin 3.
(8)
Digital multimeter will indicate between -
13 and -17 vdc. If not, see Troubleshooting Table 4-23.
(9)
Set ON-OFF-SIM ONLY to OFF.
(10)
Disconnect digital multimeter lead from J3
pin 3 and reconnect to J3 pin 5.
(11)
Set ON-OFF-SIM ONLY to ON.
(12)
Digital multimeter will indicate between
+6.5 and +9.5 vdc and set LOGIC POWER SUPPLY
switch to UP position. Digital multimeter will indicate
between -0.5 and +0.5 vdc. If not, see Troubleshooting
Table 4-23.
(13)
Set ON-OFF-SIM ONLY to OFF.
(14)
Disconnect digital multimeter from unit
tester.
(15)
Set LOGIC POWER SUPPLY switch to
DOWN position.
(16)
Set ON-OFF-SIM ONLY to ON.
(17)
Connect digital multimeter leads between
J3 pin 93 (-) 3 and J3 pin 26 (+). Digital multimeter will
indicate
approximately
2.4
vac.
If
not
see
Troubleshooting Table 4-23.
(18)
Set ON-OFF-SIM ONLY to OFF.
Table 4-23. Troubleshooting Logic Power supply (A3) (AVIM).
NOTE
Before performing troubleshooting, remove Logic Power Supply (A3) and
reconnect using extender board.
Trouble
Probable Cause
Remedy
15.5 vdc output low or missing
Interconnect cable. Logic power
Replace defective components, or re-
supply (A3). Faulty simulator
replace board (A3). See figs. 4-13, FO-6,
output.
FO-7.
-15.5 vdc output low or missing
Interconnect cable. Faulty simulator
Replace defective components, or
output Logic power supply (A3).
replace board (A3). See figs. 4-13, FO-6,
FO-7.
8 vdc output low or missing
Interconnect cable. Logic power
Replace defective components, or
supply (A3). Faulty simulator
replace board (A3). See figs. 4-13, FO-6,
Output
FO-7.
Excitation voltage output (2.4 vac)
Interconnect cable. Logic power
Replace defective components, or
supply (A3). Faulty simulator
replace board (A3). See figs. 4-13, FO-6,
output.
FO-7.
4-48 Change 2
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